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Product Revenues, Accounts Receivable, and Reserves for Product Sales - Summary of Product Revenue Allowance and Reserve Categories (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Chargebacks, Discounts, and Fees [Member]    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Beginning Balance $ 5,674 $ 164
Provision related to sales in the current year 9,575 1,466
Adjustments related to prior period sales 146  
Credits and payments made (9,724) (184)
Ending balance 5,671 1,446
Government and Other Rebates [Member]    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Beginning Balance 8,898 1,936
Provision related to sales in the current year 13,125 2,566
Adjustments related to prior period sales (19) (2)
Credits and payments made (9,906) (1,639)
Ending balance 12,098 2,861
Returns [Member]    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Beginning Balance 2,053 251
Provision related to sales in the current year 1,355 651
Adjustments related to prior period sales (96) (249)
Credits and payments made (1,859)  
Ending balance 1,453 653
Product Revenue Allowance and Reserves [Member]    
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Beginning Balance 16,625 2,351
Provision related to sales in the current year 24,055 4,683
Adjustments related to prior period sales 31 (251)
Credits and payments made (21,489) (1,823)
Ending balance $ 19,222 $ 4,960